
	Integrated Risk Information System

Radon 222 (CASRN 14859-67-7)


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0275

Radon 222; CASRN 14859-67-7

Health assessment information on a chemical substance is included in IRIS only after a comprehensive review of chronic toxicity data by U.S. EPA health scientists from several Program Offices and the Office of Research and Development. The summaries presented in Sections I and II represent a consensus reached in the review process. Background information and explanations of the methods used to derive the values given in IRIS are provided in the Background Documents.

STATUS OF DATA FOR Radon 222

File First On-Line 09/30/1987

Category (section)	Status	Last Revised
Oral RfD Assessment (I.A.)	no data
Inhalation RfC Assessment (I.B.)	no data
Carcinogenicity Assessment (II.)	withdrawn	07/01/1993

_I. Chronic Health Hazard Assessments for Noncarcinogenic Effects

_I.A. Reference Dose for Chronic Oral Exposure (RfD)

Substance Name -- Radon 222
CASRN -- 14859-67-7

Not available at this time.

_I.B. Reference Concentration for Chronic Inhalation Exposure (RfC)

Substance Name -- Radon 222
CASRN -- 14859-67-7

Not available at this time.

_II. Carcinogenicity Assessment for Lifetime Exposure

Substance Name -- Radon 222
CASRN -- 14859-67-7

The carcinogen assessment summary for this substance has been withdrawn following further review. A new carcinogen summary is in preparation by the CRAVE Work Group.

Agency Work Group Review -- 12/17/1986, 11/30/1988, 03/01/1989, 05/04/1989, 10/21/1992, 02/02/1993, 03/31/1993

Screening-Level Literature Review Findings -- A screening-level review conducted by an EPA contractor of the more recent toxicology literature pertinent to the cancer assessment for Radon 222 conducted in September 2002 did not identify any critical new studies. IRIS users who know of important new studies may provide that information to the IRIS Hotline at hotline.iris@epa.gov or (202)566-1676.

EPA Contacts:

Please contact the IRIS Hotline for all questions concerning this assessment or IRIS, in general, at (202)566-1676 (phone), (202)566-1749 (FAX) or hotline.iris@epa.gov (internet address).

_III. [reserved]
_IV. [reserved]
_V. [reserved]

_VI. Bibliography

Substance Name -- Radon 222
CASRN -- 14859-67-7

Not available at this time.

_VII. Revision History

Substance Name -- Radon 222
CASRN -- 14859-67-7

Date	Section	Description
03/01/1988	II.A.1.	Classification clarified
03/01/1988	II.B.1.	Number rounded off
06/30/1988	II.D.3.	Contacts changed
01/01/1989	II.	Withdrawn pending further review
07/01/1989	II.	Withdrawn; new assessment verified (in preparation)
01/01/1992	IV.	Regulatory actions updated
11/01/1992	II.	Work group review date added
03/01/1993	II.	Work group review date added
05/01/1993	II.	Work group review date added
07/01/1993	II.	EPA contact changed
08/01/1995	II.	EPA's RfD/RfC and CRAVE workgroups were discontinued in May, 1995. Chemical substance reviews that were not completed by September 1995 were taken out of IRIS review. The IRIS Pilot Program replaced the workgroup functions beginning in September, 1995.
04/01/1997	III., IV., V.	Drinking Water Health Advisories, EPA Regulatory Actions, and Supplementary Data were removed from IRIS on or before April 1997. IRIS users were directed to the appropriate EPA Program Offices for this information.
12/03/2002	II.	Screening-Level Literature Review Findings message has been added.